Question

Which of the following is an decreasing order of particle size ?

• A. Sandstone, siltstone, conglomerate
• B. Sandstone, conglomerate, siltstone
• C. Conglomerate, sandstone, siltstone
• D. Silitstone, sandstone, conglomerate

Answer 1

Answer:

C. Conglomerate, sandstone, siltstone

In geology, sedimentary rocks are classified based on the size of the grains (sediments) that form them:

• Conglomerate: Contains large, rounded gravel-sized particles (particles larger than 2 mm).

• Sandstone: Contains medium, sand-sized particles (particles between 0.0625 mm and 2 mm).

• Siltstone: Contains fine, silt-sized particles (particles between 0.0039 mm and 0.0625 mm).